OK. So here is what's happened to me.
1. I open avast on my laptop. It says I have 29 days remaining to register. (This exact same problem is happening on my desktop, but my registration expired on my desktop today. I'm hoping that if I can figure out how to register on my laptop, then I'll be able to do the same on my desktop when I get home from work today.)
2. I click the register button, and Avast ask that I register with Facebook, or name and e-mail. If I try name and e-mail, the software says that my e-mail is connected to my Facebook account, and I must login via Facebook.
3. I proceed to login via Facebook, and avast redirects me to the my.avast.com homepage.
That's it. I never get registered. I've also registered via the avast website and tried to enter the license that Avast sent, but the software says the license that Avast sent isn't valid.